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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b91ac1282896dd2b65ae7a70482172cb93f41b95dca1f7586f13bf2b77217b' 
  AND token = 'FFcwAxvhQHiFIA7x/EsxgkmPARNV8Ag1OiR/3HS4Yas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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