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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c46414a7e4c3219182132506a84e63731cfc1283e0f12906d3cff4ad5d852b' 
  AND token = '1V2hLtK4iZ1vCaqtEp6LY+o0ZkzMJvxcaYkzFDlCZXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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