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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2f0bae8370cc0743d47e2b1c5ef52e1a62cd75fc23c58dbac8b37164a14c8b' 
  AND token = 'wChjB7f1SFjPzafGCOml7wxHqHeML+q1Tuf/4+H+AZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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