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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba0b198f3d55d20fc0fdb5a9b5cd87189256714dde1dbb89c7a44ea46faed5a' 
  AND token = '1PldhESX75eakXWgTHDhpAqCIddwCBnVGnu8iTQ8I0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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