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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703f1a38ef6fadf69d5a434874094eb9e47345de692b7cd11aa6dfc676c6b9a9' 
  AND token = 'U4LHHse4m0cuIhewXUNonnqrSbERoHZbn9zD2ciLbz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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