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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1630844d3783b2fefa67ba8055521cc092349444808631f4829eaecf5f7c624' 
  AND token = 's8tCFvl/ibyKLdLA9Q0tL2Bb2O6y/Rkk2jn+7Sq/slQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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