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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce480b51a7a73d9c697b42abd4726c4971e56fcb40214c455b631dd3d7c18332' 
  AND token = '7N27rJV4sRmUj1lO9NDSqdACgISZ2JkgPtrrjDwMiZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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