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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2c38b605ec54eef937bf56f9dfa7684b57a31af7e77a3bfa577fde6db6aa4e' 
  AND token = 'K/UasR2InK7r4LJO7KFyY34TOTeX1FDcVYZgGdzQWec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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