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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce20b8d3ed5487e4dfabd7bc92075a42f5d61ec62fa2f440f88847ab9ccd6b91' 
  AND token = 'MZA4TrRXg8U0LWteABWQronWAiB1GvM0sUUSLvb/Kw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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