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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962960d8d66f8c1f2ac37eacec0ed3d2fbdfc1493f0d138a2a8e5ffda01ec65b' 
  AND token = '1mWLoH6w0C6/HdbQ3MISc8f7RBCKtqgRWRai/Y7VyA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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