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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f742f8d24cbe98480c9187bad37f6c0b8f300639ce2053b19b9e44f92c83c3e7' 
  AND token = 'czrz+6AoVmteHbvY8ieQTUSBx6nCi8uy7/ztFKwoYc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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