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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aeeeb671a8a139f2064b4a73682427714cc9d660ea0860913a99f0c758fba8f' 
  AND token = '9pqcN2h5UgUyD1v1eQZRKGmRgiuv9rcmW8yWP7rlYIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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