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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eac88a367c52051d3dcaff86c80a2b9cafcd8bb7ad2b36d22b58dc495d7cc8a' 
  AND token = 'qUuVAc4fjcp8Qn5oQGNn/prJUph7pC5we5QWLi+2qrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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