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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12f84dce98acb8db8490a4f3080336f82fa8883c31f405f0c41084be037d95b' 
  AND token = 'I2bH6J6JgBAGkacr1DDQrj6cA+o+mG5otdGX8pbR8IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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