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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed26a2090ef700e07733883d9063ff3aac4e3664b451e29e187220d00015957d' 
  AND token = 'Tu8MabVP5Jb3rQ7+B0l4X90iFP8LK2kL3Baps2q0yzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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