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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc274b5dc5ad7b7e9189ab33d46a6f89c4a4a979631465b0971b4d4ce333376' 
  AND token = '80L1mKN+99Arm9fUXMW6PYgHMpV3hT9uxQWCnpYONFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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