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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6098a858a3aa0b1046bf7bf1d4be170fc9153221ecf208cb18844fce8784019d' 
  AND token = '2Lgzj2a/NdQd590v8XWzvaK0PfAsfKmkPNydrnjfX8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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