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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e32e2cc9755558b946a3fb35b4eb8d46147b14ef901d6c7d304cd8ca3b853e9' 
  AND token = 'MPjb0ZH0yF0X3D3uBXpxWGhhbWZ2g9fpdxk+AI2dcuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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