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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba730d93bcc0fda8a4327ce0e722897a5674fb74a746215eca42645732f74c73' 
  AND token = 'p/L+sadd9NvrwaYxTlhZ1T4IpApxDcY5BP74nXBXzQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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