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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd256a1056e8b0972138cc6d701c3e94cbc25af1091cfe77958ab44ab28332cfe' 
  AND token = 'Nj1SjunlX3qY5h6CD8Z9z0AhODjCkOuN16nLAKaqvUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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