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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb1502a394e5eea3bd30beda2e013ce854649f7bc073688ecc0d8ba099f4f98' 
  AND token = 'ljtHili3noeRHeV/iAB23yhIZnC/B9uZRbmiT8vaogo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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