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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62067ef6e042e3fb7f4d8ed9b7becddffc0faf72dd503f27ce206c44f7de8e40' 
  AND token = 'LB2sSpVuYS9Mapg0E2oqGzQCDMgkoj73v0pcH6YE7dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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