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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd4ee54ac4cf892de0813cbfc0a8685709dea58d4b691a585ef0ee14f97b0b7' 
  AND token = 'E3uh62312hb1pszoKnGRp97jDglN7V6Up+Zt/YRZcis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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