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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb6a248760c24ae7987848a94e9f9bb84ff2dd1758430f033d7ff903ccc512c' 
  AND token = 'GV9NbJlqvCPXp2fv1CFye8bOEm/kVNUAqv6T8HA9HTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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