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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0638c12c77b7f2346f65c2fae9c3918a317a3dd2d43caf6bb99908ebc84db2cd' 
  AND token = '/JTwWUaeo1w0vv4sXw/veAjZ1/w7kNqEa44oCMTT0lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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