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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0852c249830fbcae9e4204570009a1ddbb1778b807c92a41bc5dd28628fd4f3' 
  AND token = 'GQ9deSwt3EoKVL6DWi+iNwQam0sMFlm5sbVXVP8k0Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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