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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6920816f1d222800b2d031abe082fcb59ead5ffc63682e053b8b256598722951' 
  AND token = 'XCJkqs+4khntny5ysFAVzyvwua7QNqNk1H47pmbW5CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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