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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7cd0aa339cd7dd34095f499a6b199f14367be394a17e0ae6b469ba7f61728c' 
  AND token = '5ldcSRZAkj/IEWOoiV5/fSBif/JSJjiPqcQmw6SP7sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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