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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764feb64bcad5cb7a1e6be0f854317f9857674de2f78ad902ded6e707e48139b' 
  AND token = 'msL9ozWeAyFdZMRY28tEZrh4QuumdeFIQNNAohqVOXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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