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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b18598769faebeab040518dc7f56f54118e4813af4107deea2f0d83112bda9' 
  AND token = 'NnkK016ubQxwrUQsCmPeSEjVQ88CHkLVlthqN2+vbQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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