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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9908144ddaac9926202e7f9674a1cd0a828403bc027f7070561c3b51569fe39d' 
  AND token = 's0Hw6yR6faawk4VSJeulWLNqSgUIN5liyoJFSXWCfQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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