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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d713df5a4c3aef833104c8b1364790a0eaa15b21a173d07628b7be975707de' 
  AND token = '93SMYhxhqKwngUHIN1qsZhSqra+8PuxVrDiH3iB0MXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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