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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9247ee6b116620cebb1120219f7667214defac5ad71faeee0fd46d4ee4115fd' 
  AND token = 'CQl9ect5dF4JEuMwG6FU7C0xMbGXegZ8HyM7bLvolE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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