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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550820f2a1bca45e9196fe8fc0c98ac5d805033322ca7c02d1d895701a792b11' 
  AND token = '6FPI23PRnUoqb0cuCodmI8KiBmSbmpwsCfZHDrno2I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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