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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fecc63c0c1dd62955efa2bbbe7553c0476d02035911b9442d2729e3247d9a0' 
  AND token = '+r3VBVhlDK69c4kNf6q0kyA6PTaCSTIlDTOGPxaVd7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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