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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f4e746d9d9b53742bc75b4777948b8fa307027d1b28255a65900cf4b8f2961' 
  AND token = '8sLeQhiC/F6ZExyacXixz2b07oawsVaxPcx7xWwskRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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