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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9e37291b0c80217c354327e69f65bac876704630f98a39769058a2f33572d2' 
  AND token = 'RMSoAFOdKh3N6EUG/7/wTl0H4nlFDrqGQ+cKHyM4QyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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