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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edb3b91b9d530dceaacb6984a697df522e507d7a3368339ca5879e3de2c31dd' 
  AND token = 'hmDuJk0fSUEqwUubktH2Q4RNbyr1LZof/njdrb97W/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}