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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3d39e3ce265560dafc0a39b58e1a2f320149af8f0dc2f98eaf180dd86e37f2' 
  AND token = 'Jqv3LArkGF7DcErTrb2FipYRifGNOVT4kgk5nHaiLEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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