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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063cc7aad516a1a0a36f1067ac09ca9e98370a3a2f431ff50a49d3eded99597b' 
  AND token = 'Ezr72Bn0Xw26vF9Aac0cs68su7R2acLfEdTvt0xGjIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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