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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25500d820c05468cc520804229cb42c5b4ec53d51475cf91aa3d3c95f00f9e62' 
  AND token = 'IyW50/utnlp1fiN3b/PfEJJ70088RpOXpIkXqoIvLNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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