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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cef6d7e384ffd851a9ac0febde25dc7e6c2128a35916d72204d0d0e16968a94' 
  AND token = 'TI+wCqdStcnuRL+Nu8RRHCYMg7HVUU2xpriJWcGOmiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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