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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a76c2558684cd713180e05a766445aad36e72152c958dd0ec7b27cd538b7af' 
  AND token = '65Tjts123UBmL3DBoIQ6u98EJRO7dc5VN0rivHkHkvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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