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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1658752725b556ec7acc54028b2e017a15361da07d8c7d06f15cc873fd920f73' 
  AND token = 'k+a5VhYjQDq8TWYAaJAQS6yXu0kIivW4ksG04nNHuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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