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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82712a07d1ac13c67a1bfd16fd8ee6a3562d2d258a9ff586cc798e10cb707e41' 
  AND token = '3ZYQmfNZAA/XoroOxjMtGMmIb/cTcg9QnQ0OOzUKaB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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