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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576036eaf71074a1ad736e171eb34c70df1e76c625c7b6b527d3f85469025696' 
  AND token = 'nwaQt0gyJodGV4BxvU0RZbrHxZQ4DDwkAYvSa9kHRBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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