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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d991f4ed32d98fe2100f52b5183993b29af1d9cfd6a5291bcc8583b7412e72' 
  AND token = '85/abCpcieUnJNxn6AvPyr9qcr64adYAEWU+asf055U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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