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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c4d5bd14e12704a7821e972aa21f653762738370822e49a46949dbafe5c846' 
  AND token = 'PfBxW1h0BXuBwU4/Gr2z/Oj43KdILP94iLs0MTUs3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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