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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e950bd9e3f48ef982a207fb99730866604ca38edb3395a9e46f84d8dd4554ce7' 
  AND token = '5SFKyopdK/Ohg153cRj56/+knygopoK4uaZQIkHMVQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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