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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d87ed8ac840684b3a5283fa6f848327196c8ecc382388d05df5e839daa424f' 
  AND token = 'tUfNsga54B/+QCv+lWGxFKZM8geE3R0zN8vZpljnUBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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