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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d912c7f96609aecea37529d0654ca154f3c51a11109b13824e30024a4f28262' 
  AND token = '3bkbpM8xcF2h2dWjLzRRIBhy+npKZhSmnEODq5QEUXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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