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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7875932130922de2de34747c67c330d7047b81ae9f4a615f5c55af93148cc9' 
  AND token = 'T43OpGJTEqeQOV528/pUEd/pRh17kcHBKPaOFsdn19o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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