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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f33cd5832b29f42a7f23f4fce2ca9d4ea9ee2f81ea7bf8a26a01bec5c1b40482' 
  AND token = '5pYTnpkgGlp+cfei9iFLmQqo2DcObvpGPab4QQBhXgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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