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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd968ae0697bee00d7df69e907e41ede3b83a642ba9fb906dd5e28e6ee13ded36' 
  AND token = '2gBh2HCeFKAtx9efYJX3cYb/wl7hrFY4OiD2I8AawVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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