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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972221297eeccef2ee4d94920f68f0f142fd65c39908113b5fcc134293455a88' 
  AND token = 'LB4m67KDfEm5yVGwKJ9pmdasawTl1YC21ISAYLDJFXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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